Slag screen water tubes



Feb. 3, 1931.

D. s. JACOBUS ET AL SLAG SCREEN WATER TUBES Filed Nov; 19. 1925 INVENTORS w uo Aug/ mai s Patented Feb. 3, .1931

UNITED STATES PATENT OFFICE DAVID S. JACOBUS', OF MONTCLAIR, AND HOWARDJ. KERR, OF WESTFIELD, NEW

JERSEY, ASSIGNORS TO THE BABCOCK & WILCOX JERSEY, A CORPORATION OF NEWJERSEY SLAG-SCREEN WATER TUBES Application filed November 19, 1925.

Our invention relates to a steam boiler, in which provision is made forpreventing or minimizing the accumulation of slag upon the water tubes,and is particularly applicable to a steam boiler of the Stirling type,in which upper steam and water drums are connected to a lower mud drumby banks of water tubes with baflles interposed to direct Fig. 2 is asection on an enlarged scale along the line 22 of Fig. 1. In thedrawings, reference characters 4, 5 and 6 indicate steam and water drumsthat are connected by banks of tubes 7, 8 and 9 to a mud drum 10. in themanner similar to the well-known Stirling boiler, and baflles 11, 12, 13and 14 are shown for directing the hot gases along and across the tubesand into the outlet 15. The usual superheater is shown at 16, theconnections thereto being omitted and soot blowers may be located atdesirable places, one of the same being indicated at 17.

4 Our invention is particularly useful with a furnace having firingmechanism of'the.

type which causes slag particles to rise with the hot gases that contactwith the water tubes. In operation, the hot gases from the fuel rise andcarry along particles of slagforming material which passes upwardly andinto contact with the tubes. Heretofore, serious diflieulties havearisen because of the accumulation of the slag on the front tubes of thefront bank of the boiler, and particularly on the portions of the tubesabove the bafile 11 where the gases pass. The accumulation of slag,particularly above the baffle 11, has heretofore sometimes bridgedacross adjacent tubes, thereby choking the passage or Serial No. 69,970.

cutting it off altogether and requiring the shutting down of the boileruntil the slag could be removed. In accordance with our invention, thefront tubes of the front bank 9 of tubes are so arranged thatdifficulties due to the accumulation of slag thereon are obviated. Inorder to do this, the front-rows of tubes of the bank 9 are preferablyspaced farther apart than the other rows in this bank, and the tubes inthe front rows are also spaced farther from each other than the tubes inthe other rows. Preferably in accordance with our invention, the twofront rows of tubes are so modified by the wider spacing, and theremaining tubes of the bank of tubes are installed in the usual manner.In the embodiment of our invention shown on the drawings, the baflle 11is installed behind three rows of tubes, the row 9 being one of theusual rows and the rows 9 and 9 being rows of tubes installed inaccordance with our invention. The row 9 is installed substantially thesame distance from the next succeeding row as the distance betweensucceeding rows, but the tubes of the row 9 are installed in staggeredrelation to the tubes in the row 9" and the rows 9 and 9 are preferablyfarther apart than the other-rows of the bank of tubes. At the sametime, the ends of the tubes 9 are bent through a longer are to enablethe ends of the tubes in both the rows 9 and 9 to enter the drums 6 and10 along single rows of holes.

COMPANY; OF BAYONNE, NEW

ing rows of tubes. There are thus left wide We claim:-

1. In combination, a water tube boiler having an upper transverse steamand water drum connected to a lower mud drum by a bank of tubes arrangedin rows, the tubes in the first and second rows of tubes of said bankbeing spaced farther apart from each other than the tubes in therearrows and entering each of said drums along a single row of holes.

2. In combination, a water tube boiler having an upper transverse steamand water drum connected to a lower mud drum by a bank of tubes arrangedin rows, the first and second rows of tubes being spaced from each otherfarther than the spacing between the other rows of tubes in said bank,and the tubes in each of said two front rows being spaced apart fartherthan the tubes inthe other rows of tubes in said bank.

In combination, a water tube boiler having an upper transverse steam andwater drum connected to a lower mud drum by a bank of tubes arranged inrows, the tubes in the first and second rows of tubes of said bank beingstaggered with respect to eachother and spaced farther apart thanthetubes of other rows, said front rows of tubes entering each of saiddrums along a longitudinal row of holes. I

4. In combination, a water tube boiler having an upper transverse steamand water drum connected to a lower mud drum by a bank of tubes arrangedin rows, a battle between certain of said rows oftubes, and rows oftubes in front of said bafile spaced farther apart than the rear rowsand entering each of said drums along a single row of holes.

5. In combination, a Water tube boiler having an upper transverse steamand water drum connected to a lowermud drum by a bank of tubes arrangedin rows, the two front rows of tubes being spaced from each otherfarther than the spacing between the other rows of tubes in said bank,said two front rows of tubes entering said drums along single rows ofholes.

- 6, In combination, a water tube boiler having an upper transversesteam and water drum connected to a lower mud drum by a bank of tubesarranged in rows, each tube in a front row of tubes being located infront of a series'of tubes in successive rows, and each tube of the nextto the front row being located in front of a different series of tubesin successive rows, tubes of the two front rows being straight for mostof their length, and entering each of said drums along a single line.

7 In a boiler, a bank of tubes arranged in rows, the main portion of thetubes in the two front rows of said bank being spaced farther apart thanthe tubes in the other rows,

.the two together containing as many tubes as are contained in one ofthe other rows of tubes of said bank, with all of their adjacent endslocated in single rows. 7

8. In a Water tube boiler ofothe type that comprises drums arranged atthe ends of the water tubes, the combination of a combustion chamber,and a tube bank that serves as the rear wall of said combustion chamber,said bank being made up of transverse rows of closely spaced tubes and aplurality of front groups of widely spaced tubes, the end portions ofthe tubes constituting said front groups being in transverse alignmentwith each other at the points where they are connected to the drums.

9. In a water tube boiler of the type that comprises drums arranged atthe ends of the water tubes, the combination of a combustion chamber,and'a tube bank that serves as the rear wall of said combustion chamber,

the tubes at the front side of said bank being disposed so as to form aplurality of groups of staggered tubes whose end portions are intransverse alignment with each other and whose intermediate portions arespaced farther apart than the remaining transverse rows of tubes of thebank.

10. In a water tube boiler, the combination of an upper drum and a lowerdrum, a combustion chamber, and a bank of upright water tubes connectedto said drums that forms the rear wall of said combustion chamber, saidbank including front tubes which are disposed so that the end portionsof same are in transverse alignment with each other but theirintermediate portions are arranged in staggered relation and spaced withrelatively wide spaces between same.

11. In a boiler having a furnace, a bank of tubes arranged in rows, anda plurality of rows of slag screen tubes between said bank and saidfurnace, with the planes of the center lines of the rows of slag screentubes, for at least a portion of the length of the tubes,.

spaced farther apart than the planes ofcenter lines of the rows in saidbank, and all of the adjacent ends of the slag screen tubes located insingle rows.

12. In a boiler having a furnace, a bank of tubes arranged in rows, anda plurality of rows of slag screen tubes between said bank and saidfurnace, with the tubes in the rows of slag screen tubes staggered withrespect to each other and all of the adjacent ends of the slag screentubes located in single rows.

DAVID S. JACOBUS. HOWARD J KERRJ

